Method of tuning receivers operating on potential resonance



June 29, 1937; H. E. HOLLMANN 2,035,022

METHOD OF TUNING RECEIVERS OPERATING ON POTENTIAL RESONANCE Filed April l5. 1935 INVENTOR HANS ERC H MANN BY 7 V W ATTORNEY Patented June 29, 1937 METHOD OF TUNING RECEIVERS OPERAT- ING N POTENTIAL RESONANCE Application April 15, 1935, Serial No. 16,305 In Germany April 23, 1934 8 Claims. (Cl. 25027) It is known that methods used for the generacoupling means such as a transformer is p tion of ultra-short Waves, such as the retarding A retarding field type rectifier, predicate field method and the magnetron method, are also the principle hereinbefore outlined com that the apparatus can be tuned by simple variwhich, as known in the art, the two antenna ation of the acceleration voltage for the electrons halves A and A (dipole) are connected. The to the wave that is to be received. If the transit retarder electrode B is directly united with the times of the electrons agree with the period of cathode, though it would also be feasible to imthe incoming oscillations, de-attenuation occurs, press upon it a suitable biasing potential either and the receiver apparatus will then have its from a distinct source or tapped from a high 10 in terms of wave length. cuit includes also the resistance W which, so far Apart from the electrode potentials, the elecas the modulation currents are concerned, is tron transit times depend upon the strength of shunted by the capacity 0. Regulation of the acceleration potential in wave lengths may be voltage of the space charge grid GI, upon which regarded as holding good with adequate accuracy, a variable biasing potential is impressed by way also for a definite strength of current to which of the voltage divider P. The grid current i the receiver set must be regulated prior to the thug produces across W a fall of voltage 2' W, voltage determination proper. In calibrating the which may be regulated by the aid f the Said receiver, the regulation of the emission current Voltage divider P, so that th e grid voltage turns 5 is effected by positive acting means. According out to be equal to Eg (2-g2 It will be under to the invention, voltage tuning is effected by load resistance and the battery voltage, condi- In a Similar manner the basic idea 9 the tions may be so adjusted that the receiver will mventlon can be apphed to any deslred kmd of of the plate volt-meter, there is then used a also dispensed with so that the whole manipulameasuring instrument for the emission current ti of the receiver, as a matter of fact, is con- Which is to be calibrated directly to read in terms fined to a, regulation of the emission current by of wave length. 7 the aid of a single knob.

In the case of indirectly heated tubes, regu- What is Claimed lation of the Current given Ofi from the Cathode 1. In combination, an electron discharge device by variation of the heating current is impractical h Ving an anode, a th and a grid a dipole because of the great thermal inertia of such cathantenna having two arms, one arm being coupled odes, for which reason the rhglllation in the D to said anode and the other arm to said grid, and ent invention is effected mo e Suitably y Way Of means for maintaining said grid at a high posia distinct regulator grid to which a variable biasfiv potential and i anode t a l potential ins v ta is imparted- Furthermore, the d relative to said cathode, said means including a resista permitting e Voltage source of potential whose negative terminal is measuring instrument in circuit with said resistance, means for varying the proportion of grid voltage absorbed by said resistance, and translating apparatus coupled to said grid circuit.

2. In combination, an electron discharge device having an anode, a cathode and a grid, a dipole antenna having two arms, one arm being coupled to said anode and the other arm to said grid, and means for maintaining said grid at-a high positive potential and said anode at a less potential relative to said cathode, said means including a source of potential whose negative terminal is connected to said cathode and whose positive terminal is connected to said grid, a resistance located between said positive terminal and said grid for absorbing part of said grid voltage, and means including another grid located between said first grid and cathode and having an adjustable bias potential applied thereto for varying the proportion of grid voltage absorbed by said resistance.

3. In an ultra high frequency receiving system, an electron discharge device having an anode, a cathode and a grid, a dipole antenna having two arms, one arm being coupled to said anode and the other arm to taining said grid at a high positive potential and said anode at a less potential r' lative to said cathode, said means including a source of potential whose negative terminal is connected to said cathode and whose positive terminal is connected to said grid, a series circuit of a transformer winding, a meter calibrated in wave lengths, and a resistance located between said grid and positive terminal, a condenser in parallel to said resistance, and a utilization circuit inductively coupled to said transformer winding.

4. A system in accordance with claim 3, characterized in this that said electron discharge device comprises an indirectly heated tube, including an auxiliary grid located between said first grid and said cathode, a potentiometer between said cathode and said source of potential and a connection from said auxiliary grid to a point intermediate the ends of said potentiometer.

5. In combination, an electron discharge device having an anode, a cathode and a grid, a dipole antenna having two arms, one arm being coupled to said anode and the other arm tosaid grid, and means for maintaining said grid at a high positive potential and said anode at a less potential relative to said cathode, said means including a source of potential whose negative terminal is connected to said cathode and whose positive terminal is connected to said grid, a resistance 10- said grid, and means for maincated between said positive terminal and said grid for absorbing part of said grid voltage, a measuring instrument calibrated in wave lengths in circuit with said resistance, a condenser in shunt with said resistance, and translating apparatus coupled to said grid circuit,

6. In combination, an electron discharge device having an anode, a cathode and a grid, adipole antenna having two arms, one arm being coupled to said anode and the other arm to said grid, and means for maintaining said grid at a high positive potential and said anode at a less potential relative to said cathode, said means including a source of potential whose negative terminal is connected to said cathode and whose positive terminal is connected to said grid, a'resistance located between said positive terminal and said grid for absorbing part of said grid voltage, a condenser in parallel with said resistancaand means including an additional electrode in said device for varying the proportion of grid voltage absorbed by said resistance. 7

7.'In combination, an electron discharge device having an anode, a cathode and a grid, means for maintaining said grid at a high positive potential and said anode at a less potential relative to said cathode, said means including a source of potential having a negative terminal connected to said cathode and a positive terminal connected to said grid, a resistive load located between said positive terminal and said grid for absorbing part of the grid voltage, and an auxiliary electrode located between said cathode and first grid and having an adjustable bias potential applied thereto for' varying the proportion of grid voltage absorbed by said load.

8. In combination, an electron discharge device having an anode, a cathode and. a grid, an input circuit having one terminal connected to said anode and its other terminal connected to said: grid, means for maintaining said grid at a high positive potential and said anode at a less potential relative to said cathode, said means including a source of potential having a negative terminal connected to said cathode and a positive terminal connected to said grid, between said positive terminal and said grid for absorbing part of the grid voltage, and an auxiliary electrode located between said cathode and first grid and having an adjustable bias potential, applied thereto for varying the proportion of grid voltage absorbed by said load.

a resistive load located 

